<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区域-->
    <el-card>
      <!--提示区域-->
      <el-alert
        title="添加商品信息"
        type="info" :closable="false" center show-icon>
      </el-alert>
      <!--步骤条区域-->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center> <!--减0是为了将字符串的0转化为数字0-->
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!--tab栏区域-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat" v-model="addForm.goods_cat">
              <el-cascader
                v-model="value"
                expandTrigger="hover"
                :options="cateList"
                :props="cateProps"
                @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的item项-->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!--复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--action表示图片要上传到的后台API地址-->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture" :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--富文本编辑器组件-->
            <quill-editor v-model="goods_introduce">
            </quill-editor>
            <!--添加商品的按钮-->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!--图片预览-->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  name: "Add",
  data () {
    return {
      activeIndex: '0',
      /*添加商品的表单数据对象*/
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        /*商品所属的分类数组*/
        goods_cat: [],
        /* 图片的数组 */
        pics: [],
        /*商品的详细描述*/
        goods_introduce: ''
      },
      addFormRules: {
        goods_name: [{
          required: true, message: '请输入商品名称', trigger: 'blur'
        }],
        goods_price: [{
          required: true, message: '请输入商品价格', trigger: 'blur'
        }],
        goods_weight: [{
          required: true, message: '请输入商品重量', trigger: 'blur'
        }],
        goods_number: [{
          required: true, message: '请输入商品数量', trigger: 'blur'
        }],
        goods_cat: [{
          required: true, message: '请选择商品分类', trigger: 'blur'
        }]
      },
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      /*动态参数列表数据*/
      manyTableData: [],
      /*静态属性列表数据*/
      onlyTableData: [],
      /* 上传图片的URL地址 */
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      /*图片上传组件的headers请求头信息*/
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false,
      attrs: []
    }

  },
  created() {
    this.getCateList();
  },
  methods: {
    /*获取所有商品分类数据*/
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if(res.meta.status!==200){
        return this.$message.error("获取商品列表失败！")
      }
      this.cateList = res.data
    },
    /*级联选择器选中项发生变化触发的函数*/
    handleChange() {
      if(this.addForm.goods_cat.length!==3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName,oldActiveName) {
      if(oldActiveName==='0'&&this.addForm.goods_cat.length!==3) {
        this.$message.error("请先选择商品分类！")
        return false
      }
    },
    async tabClicked() {
      /*等于1说明访问的是动态参数面板*/
      if(this.activeIndex ==='1') {
        const {data: res} = await this.$http.get('categories/${this.cateId}/attributes', {params: {
            sel: 'many'
          }})
      if(res.meta.status!==200){
        return this.$message.error("获取动态参数列表失败！")
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
      })
      this.manyTableData = res.data
      }else if(this.activeIndex ==='2') {
        const {data: res} = await this.$http.get('categories/${this.cateId}/attributes', {params: {
            sel: 'only'
          }})
        if(res.meta.status!==200){
          return this.$message.error("获取静态属性列表失败！")
        }
        this.onlyTableData = res.data
      }
    },
    /*处理图片预览效果*/
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    /*处理移除图片的操作*/
    handleRemove(file) {
      /*1.获取将要删除的图片的临时路径*/
      const filepath = file.response.data.tmp_path
      /*2.从pics数组中找到该图片对应的索引值*/
      const i = this.addForm.pics.findIndex(x => x.pic === filepath)
      /*3.利用数组的splice方法，移除数组中的图片对象*/
      this.addForm.pics.splice(i,1)
    },
    /*监听图片上传成功的事件*/
    handleSuccess(response) {
      /*1.拼接得到一个图片信息对象*/
      const picInfo = {
        pic: response.data.tmp_path
      }
      /*2.将图片信息对象push到pics数组里*/
      this.addForm.pics.push(picInfo)
    },
    /*添加商品*/
    add() {
      this.$refs.addFormRef.validate(valid => {
        if(!valid) {
          this.$message.error("请填写必要的表单项！")
        }
        /*执行添加的业务逻辑*/
        /*深拷贝一份addForm*/
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        /*处理动态参数*/
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        /*处理静态属性*/
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs

        /*发起请求添加商品*/
        /*商品的名称必须是唯一的*/
        const {data: res} = this.$http.post('goods', form)
        if (res.meta.status!==200){
          return this.$message.error("添加商品失败！")
        }
        this.$message.success("添加商品成功！")
        this.$router.push('/goods')




      })
    }

  },
  computed: {
    cateId() {
      if(this.addForm.goods_cat.length===3){
        return this.addForm.goods_cat[2];
      }
      return null
    }
  }

}
</script>

<style lang="less" scoped>
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%
}
.btnAdd{
  margin-top: 15px;
}

</style>
